Hi,
Additionally, our menu is just a standard WP menu. I also don’t know how Polylang work, but did you try to take a look at Appearrence -> menus -> choose WP Customer Area location menu.
Then, I presume that Polylang adds a way to translate the menu on that page. Since our menu is just a standard WP menu, I think it should work out of the box.
Regards.
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